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//! Session event sender management.
//!
//! Re-exports the shared `get_or_create_event_sender` function from the runtime crate.
//! The `impl AppState` method delegates to the re-exported function.
pub use bamboo_engine::execution::session_events::get_or_create_event_sender;
impl super::AppState {
/// Get (or create) a long-lived session event sender for a session id.
///
/// This stream is intended for UI consumption and background activity; it should remain
/// available even when no agent execution is running.
pub async fn get_session_event_sender(
&self,
session_id: &str,
) -> tokio::sync::broadcast::Sender<bamboo_agent_core::AgentEvent> {
get_or_create_event_sender(&self.session_event_senders, session_id).await
}
/// Ensure a notification relay task is running for `session_id`.
///
/// The relay subscribes to the session's event broadcast, runs the backend
/// notification policy on each event, and re-broadcasts any resulting
/// `AgentEvent::Notification` onto the same channel so connected SSE clients
/// receive it. Idempotent: at most one relay per session (tracked by the
/// notification service). The relay does not hold a `Sender` clone, so the
/// channel still closes naturally when the session is torn down.
pub fn ensure_notification_relay(
&self,
session_id: &str,
sender: tokio::sync::broadcast::Sender<bamboo_agent_core::AgentEvent>,
) {
if !self.notification_service.try_begin_relay(session_id) {
return;
}
let service = self.notification_service.clone();
let senders = self.session_event_senders.clone();
let sid = session_id.to_string();
let mut rx = sender.subscribe();
drop(sender);
tokio::spawn(async move {
use tokio::sync::broadcast::error::RecvError;
loop {
match rx.recv().await {
Ok(event) => {
if let Some(notification) = service.notify(&sid, &event) {
let tx = senders.read().await.get(&sid).cloned();
if let Some(tx) = tx {
let _ = tx.send(notification);
}
}
}
Err(RecvError::Lagged(_)) => continue,
Err(RecvError::Closed) => break,
}
}
service.end_relay(&sid);
});
}
}